I am using a portable ICOM A6 transceiver that I attached to the front dash and I have a recommended Spiros antenna running about 3ft back from the end of the tail boom. Static is so intense that I cannot hear anybody once the engine is operating. Had the same static noise issue with the stock ICOM transceiver mounted antenna. The ICOM runs off its own rechargable battery pack... not the Mosquito battery on my MZ202. Also using a David Clark H-30 headset.

There are a lot of information on the forum, however this is my setup, it works pretty well.

radio: Microair 760
Antenna: 118-137 sirio MD Aviation
The antenna is mounted on the tail boom to the height of the horizontal stabilizer, I shielded: plug wires, coils, wires from the coils to the CDI, CDI using an aluminum box.
completely solve the problem of RFI is difficult, you have to find a compromise.